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Old 08-09-2012, 04:59 AM   #11
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Quote:
Originally Posted by AgentTikki

Ok, wha what? Where wut? Huh? NO.

This is fud. Nothing to see here move on.
What do you mean by this gibberish?
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Old 08-09-2012, 05:32 AM   #12
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What do you mean by this gibberish?
That explaination of twist rates cause me great confusion and trepidation.

It is not accurate nor logical. Disregard it.
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Old 08-09-2012, 12:49 PM   #13
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Quote:
Originally Posted by AgentTikki

That explaination of twist rates cause me great confusion and trepidation.

It is not accurate nor logical. Disregard it.
Did me to till I read a thread on it. Kinda get it.
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Old 08-09-2012, 02:37 PM   #14
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This chart was provided by Deiselpower @ Calguns.net as a chart to help you visualize what today's common twist rates are compatible with.

Please keep in mind that this is a generalization as twist rates correlate to the projectiles overal length, NOT weight. Notable expections are M855 steel core, and frangible projectiles.



Thx fer suggesting me to put this up Q! Much obliged!


This a general guideline, it is not 100% accurate but gives you and idea.

And yeah 1/9 is optimal for 55 gr m193.

1/12 is better for 36 gr lengths.

80 gr vlds do well in both 1/8 and 1/7 twists.

And m855 62 gr steel core does'nt do well in any barrel. Its inconsistent and generally considered 2moa to 3moa ammo at best.
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Old 08-09-2012, 03:26 PM   #15
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http://www.firearmstalk.com/forums/f20/ar15-primer-beginners-guide-59600/

What twist rate is good for me?

The longer the projectile, the faster the twist is needed in the barrel. Nowadays, the most common rate is 1x9 (one twist per nine inches), which is optimal for stabilizing 55 grain. 1x9 means one full revolution (twist) every 9 inches. This twist will adequately stabilize and 62-69 grain bullet but may have trouble with the heavier/longer 75 grain and up bullets. I cannot be exact here because every barrel manufacturer is different, and every barrel is different. This is just a general guideline.

The second most common twist is 1x7. Most milspec barrels are 1x7 because they need to stabilize the very long tracer rounds. It will adequately handle a 55 grain projectile. And handle 80 grain bullets and everything in between. The optimal projectile is about 75 grain. It should not be used for very short projectiles i.e. 40 and 46 grain projectiles.

The third most common twist is 1x8. This is usually used by precision oriented stainless barrels. The most notable exception is S&W’s MP15, which uses this rate. My personal belief is that this is a great middle of the road rate and should be used more often. It handles the 55 grain projectiles well as well as everything up to 77 grains. You would need to test it out for yourself. It’s optimal at about the 67 grain size.

There are slower twist barrels such as 1x12 twist. These barrels are optimal for smaller projectiles, like 36 and 40 grain bullets. These are usually for varmiters that use specialized bullets for their hunting needs.
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Old 08-09-2012, 05:16 PM   #16
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Thanks for the input it was very helpful .

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